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Saturating Rounding Q-format Multiplication #365

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Saturating Rounding Q-format Multiplication #365

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3 changes: 2 additions & 1 deletion proposals/simd/BinarySIMD.md
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Original file line number Diff line number Diff line change
Expand Up @@ -161,7 +161,7 @@ For example, `ImmLaneIdx16` is a byte with values in the range 0-15 (inclusive).
| `i16x8.min_u` | `0x97`| - |
| `i16x8.max_s` | `0x98`| - |
| `i16x8.max_u` | `0x99`| - |
| `i16x8.avgr_u` | `0x9b`| |
| `i16x8.avgr_u` | `0x9b`| - |
| `i32x4.abs` | `0xa0`| - |
| `i32x4.neg` | `0xa1`| - |
| `i32x4.any_true` | `0xa2`| - |
Expand Down Expand Up @@ -237,3 +237,4 @@ For example, `ImmLaneIdx16` is a byte with values in the range 0-15 (inclusive).
| `i64x2.extmul_high_i32x4_s` | `0x119`| - |
| `i64x2.extmul_low_i32x4_u` | `0x11a`| - |
| `i64x2.extmul_high_i32x4_u` | `0x11b`| - |
| `i16x8.q15mulr_sat_s` | `TBD`| - |
1 change: 1 addition & 0 deletions proposals/simd/ImplementationStatus.md
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Expand Up @@ -130,6 +130,7 @@
| `i16x8.max_s` | `-msimd128` | :heavy_check_mark: | | | :heavy_check_mark: |
| `i16x8.max_u` | `-msimd128` | :heavy_check_mark: | | | :heavy_check_mark: |
| `i16x8.avgr_u` | `-msimd128` | :heavy_check_mark: | | | :heavy_check_mark: |
| `i16x8.q15mulr_sat_s` | | | | | |
| `i32x4.abs` | `-msimd128` | :heavy_check_mark: | | | :heavy_check_mark: |
| `i32x4.neg` | `-msimd128` | :heavy_check_mark: | | :heavy_check_mark: | :heavy_check_mark: |
| `i32x4.any_true` | `-msimd128` | :heavy_check_mark: | | :heavy_check_mark: | :heavy_check_mark: |
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13 changes: 13 additions & 0 deletions proposals/simd/SIMD.md
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Expand Up @@ -509,6 +509,19 @@ def S.sub_sat_u(a, b):
return S.lanewise_binary(subsat, S.AsUnsigned(a), S.AsUnsigned(b))
```

### Saturating integer Q-format rounding multiplication

* `i16x8.q15mulr_sat_s(a: v128, b: v128) -> v128`

Lane-wise saturating rounding multiplication in Q15 format:

```python
def S.q15mulr_sat_s(a, b):
def subq15mulr(x, y):
return S.SignedSaturate((x * y + 0x4000) >> 15)
return S.lanewise_binary(subsat, S.AsSigned(a), S.AsSigned(b))
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Hi, is this subsat should be subq15mulr?

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Right

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Oops, didn't catch that during review - fixed in #424.

```

### Lane-wise integer minimum
* `i8x16.min_s(a: v128, b: v128) -> v128`
* `i8x16.min_u(a: v128, b: v128) -> v128`
Expand Down